Why does ion propulsion, which expels material much faster than ordinary chemical rockets, hold such promise for future space travel?
What will be an ideal response?
Much less fuel is needed since the same impulse can be delivered to the rocket by less mass expelled at greater speed.
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A man of weight Wman is standing on the second floor and is pulling on a rope to lift a box of weight Wbox from the floor below. The rope, which is of negligible weight, has tension T in it, but the pull of the rope is insufficient to lift the box off the floor. What is the magnitude of the normal force that the second floor exerts on the man in this situation?
a. Wman b. Wman + T c. Wman + T + a nonzero portion of Wbox d. Wman + T + Wbox
In an analysis relating Bohr's theory to the de Broglie wavelength of electrons, when an electron moves from the n = 1 level to the n = 2 level, the circumference for its orbit becomes 4 times greater. This occurs because
a. there are four times as many wavelengths in the new orbit. b. the wavelength of the electron becomes four times as long. c. there are twice as many wavelengths, and each wavelength is twice as long. d. the electron is moving four times as fast.
A series of transitions in atomic hydrogen that produce emissions all in the ultraviolet portion of the spectrum are those ending in the level
A. n = 2. B. n = 4. C. n = 1. D. n = 3. E. n = 5.
Light excites atomic hydrogen from its lowest level to the n = 4 level. What is the energy of the light? The energy of the lowest level is -13.6 eV
A) 12.8 eV B) 3.40 eV C) 0.850 eV D) 26.4 eV